Comments Invited The FAA invites you to send any written data, views, or arguments about this final rule. Send your comments using a method listed under the ADDRESSES section. Include "Docket No. FAA-2026-0013; Project Identifier MCAI-2025-01774-T" at the beginning of your comments. The most helpful comments reference a specific portion of the final rule, explain the reason for any recommended change, and include supporting data. The FAA will consider all comments received by the closing date and may amend this final rule because of those comments. Except for Confidential Business Information (CBI) as described in the following paragraph, and other information as described in 14 CFR 11.35, the FAA will post all comments received, without change, to regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this final rule. Confidential Business Information CBI is commercial or financial information that is both customarily and actually treated as private by its owner. Under the Freedom of Information Act (FOIA) (5 U.S.C. 552), CBI is exempt from public disclosure. If your comments responsive to this AD contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this AD, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI as "PROPIN." The FAA will treat such marked submissions as confidential under the FOIA, and they will not be placed in the public docket of this AD. Submissions containing CBI should be sent to Fatin Saumik, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: 516-228-7300; email: fatin.r.saumik@faa.gov. Any commentary that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking. Background Transport Canada, which is the aviation authority for Canada, has issued Transport Canada AD CF-2025-63, dated November 28, 2025 (Transport Canada AD CF-2025-63) (also referred to as the MCAI), to correct an unsafe condition for all MHI RJ Aviation ULC Model CL-600-2B19 (Regional Jet Series 100 & 440), CL-600-2C10 (Regional Jet Series 700, 701 & 702), CL-600-2C11 (Regional Jet Series 550), CL-600-2D15 (Regional Jet Series 705), CL-600-2D24 (Regional Jet Series 900), and CL-600-2E25 (Regional Jet Series 1000) airplanes. The MCAI states that multiple events were reported of elevator autopilot control cable failure leading to elevator control restriction. Further investigation found that the autopilot control cable can fracture due to cyclic fatigue. Failure of the elevator autopilot control cable may cause jamming of the elevator servo drum, restricting elevator movement in one direction. An elevator servo drum jam during the landing phase can result in insufficient elevator control authority and could lead to loss of continued safe flight and landing. The FAA is issuing this AD to address the unsafe condition on these products. You may examine the MCAI in the AD docket at regulations.gov under Docket No. FAA-2026-0013. Material Incorporated by Reference Under 1 CFR Part 51 The FAA reviewed Transport Canada AD CF-2025-63, which specifies procedures for replacing the elevator autopilot control cables with new cables. This material is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in the ADDRESSES section. FAA's Determination These products have been approved by the civil aviation authority of another country and are approved for operation in the United States. Pursuant to the FAA's bilateral agreement with this State of Design Authority, that authority has notified the FAA of the unsafe condition described in the MCAI and material referenced above. The FAA is issuing this AD after determining that the unsafe condition described previously is likely to exist or develop on other products of the same type design. Requirements of This AD This AD requires accomplishing the actions specified in Transport Canada AD CF-2025-63 described previously, except for any differences identified as exceptions in the regulatory text of this AD. See "Differences Between This AD and the MCAI" for a discussion of the general differences included in this AD. Differences Between This AD and the MCAI Table 1 of the MCAI specifies compliance times ranging from 8 months to 23 months, depending on the airplane configuration. However, the FAA has reduced each compliance time by 3 months as specified in Figure 1 to paragraph (h) of this AD. The FAA has determined a significant portion of the U.S. fleet is at risk of experiencing a cable break during flight, resulting in an immediate safety of flight issue for the U.S. fleet. The majority of the U.S. fleet has accumulated over 40,000 total flight hours and has elevator autopilot control cables with over 40,000 total flight hours on the cables. Those airplanes must do the replacement required by this AD within 5 months after the effective date of this AD. The FAA has coordinated the revised compliance times with Transport Canada. Explanation of Required Compliance Information In the FAA's ongoing efforts to improve the efficiency of the AD process, the FAA developed a process to use some civil aviation authority (CAA) ADs as the primary source of information for compliance with requirements for corresponding FAA ADs. The FAA has been coordinating this process with manufacturers and CAAs. As a result, Transport Canada AD CF-2025-63 is incorporated by reference in this AD. This AD requires compliance with Transport Canada AD CF-2025-63 in its entirety through that incorporation, except for any differences identified as exceptions in the regulatory text of this AD. Material required by Transport Canada AD CF-2025-63 for compliance will be available at regulations.gov under Docket No. FAA-2026-0013 after this AD is published. Justification for Immediate Adoption and Determination of the Effective Date Section 553(b) of the Administrative Procedure Act (APA) (5 U.S.C. 551 et seq. ) authorizes agencies to dispense with notice and comment procedures for rules when the agency, for "good cause," finds that those procedures are "impracticable, unnecessary, or contrary to the public interest." Under this section, an agency, upon finding good cause, may issue a final rule without providing notice and seeking comment prior to issuance. Further, section 553(d) of the APA authorizes agencies to make rules effective in less than thirty days, upon a finding of good cause. An unsafe condition exists that requires the immediate adoption of this AD without providing an opportunity for public comments prior to adoption. The FAA has found that the risk to the flying public justifies forgoing notice and comment prior to adoption of this rule because elevator autopilot control cable failure, if not addressed, could result in jamming of the elevator servo drum, restricting elevator movement in one direction. An elevator servo drum jam during the landing phase can result in insufficient elevator control authority and could lead to loss of continued safe flight and landing. If the unsafe condition is discovered during landing, there will not be enough time for the crew to adapt to the issue. Additionally, the compliance time in this AD is shorter than the time necessary for the public to comment and for publication of the final rule. Accordingly, notice and opportunity for prior public comment are impracticable and contrary to the public interest pursuant to 5 U.S.C. 553(b). In addition, the FAA finds that good cause exists pursuant to 5 U.S.C. 553(d) for making this amendment effective in less than 30 days, for the same reasons the FAA found good cause to forgo notice and comment. Regulatory Flexibility Act The requirements of the Regulatory Flexibility Act (RFA) do not apply when an agency finds good cause pursuant to 5 U.S.C. 553 to adopt a rule without prior notice and comment. Because the FAA has determined that it has good cause to adopt this rule without notice and comment, RFA analysis is not required. Costs of Compliance The FAA estimates that this AD affects 711 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD: Estimated Costs for Required Actions Labor cost Parts cost Cost per product Cost on U.S. operators 10 work-hours × $85 per hour = $850 Up to $1,685 Up to $2,535 Up to $1,802,385. According to the manufacturer, some or all of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected individuals. The FAA does not control warranty coverage for affected individuals. As a result, the FAA has included all known costs in the cost estimate. Authority for This Rulemaking Title 49 of the United States Code specifies the FAA's authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. Subtitle VII: Aviation Programs, describes in more detail the scope of the Agency's authority. The FAA is issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701: General requirements. Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action. Regulatory Findings This AD will not have federalism implications under Executive Order 13132. This AD will not have a substantial direct effect on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government. For the reasons discussed above, I certify that this AD: (1) Is not a "significant regulatory action" under Executive Order 12866, and (2) Will not affect intrastate aviation in Alaska. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. The Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: PART 39-AIRWORTHINESS DIRECTIVES 1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] 2. The FAA amends § 39.13 by adding the following new airworthiness directive: 2026-02-03 MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.): Amendment 39-23239; Docket No. FAA-2026-0013; Project Identifier MCAI-2025-01774-T. (a) Effective Date This airworthiness directive (AD) is effective February 5, 2026. (b) Affected ADs None. (c) Applicability This AD applies to all MHI RJ Aviation ULC (Type Certificate previously held by Bombardier, Inc.) airplanes, certificated in any category, as identified in paragraphs (c)(1) through (6) of this AD. (1) Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes. (2) Model CL-600-2C10 (Regional Jet Series 700, 701, and 702) airplanes. (3) Model CL-600-2C11 (Regional Jet Series 550) airplanes. (4) Model CL-600-2D15 (Regional Jet Series 705) airplanes. (5) Model CL-600-2D24 (Regional Jet Series 900) airplanes. (6) Model CL-600-2E25 (Regional Jet Series 1000) airplanes. (d) Subject Air Transport Association (ATA) of America Code 27, Flight control. (e) Unsafe Condition This AD was prompted by multiple reports of elevator autopilot control cable failure. The FAA is issuing this AD to address elevator autopilot control cable failure. The unsafe condition, if not addressed, could result in jamming of the elevator servo drum, restricting elevator movement in one direction. An elevator servo drum jam during the landing phase can result in insufficient elevator control authority and could lead to loss of continued safe flight and landing. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Requirements Except as specified in paragraph (h) of this AD: Comply with all required actions and compliance times specified in, and in accordance with, Transport Canada AD CF-2025-63, dated November 28, 2025 (Transport Canada AD CF-2025-63). (h) Exception to Transport Canada AD CF-2025-63 Where Transport Canada AD CF-2025-63 specifies to do the actions within the compliance time shown in Table 1 of Transport Canada AD CF-2025-63, for this AD, the actions must be done within the applicable compliance times identified in Figure 1 to paragraph (h) of this AD. Figure 1 to Paragraph ( h )-Compliance Time Airplane model Elevator autopilot control cable total flight hours as of the effective date of this AD a Compliance time CL-600-2C10, CL-600-2C11, CL-600-2D15, CL-600-2D24, and CL-600-2E25 More than 40,000 5 months (after the effective date of this AD). Between 25,000 and 40,000 11 months (after the effective date of this AD). Between 20,500 and 24,999 15 months (after the effective date of this AD). Between 12,000 and 20,499 20 months (after the effective date of this AD). Less than 12,000 Before the elevator autopilot control cables reach 16,000 total flight hours. CL-600-2B19 More than 40,000 11 months (after the effective date of this AD). Between 12,000 and 40,000 15 months (after the effective date of this AD). Less than 12,000 Before the elevator autopilot control cables reach 16,000 total flight hours. a If elevator autopilot cable total flight hours cannot be demonstrated, airplane total flight hours since entry into service must be used to determine compliance time. (i) Special Flight Permits Special flight permits may be issued in accordance with 14 CFR 21.197 and 21.199 to operate the airplane to a location where the airplane can be modified (if the operator elects to do so), provided no passengers are onboard. (j) Additional AD Provisions The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, International Validation Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or responsible Flight Standards Office, as appropriate. If sending information directly to the manager of the International Validation Branch, send it to the attention of the person identified in paragraph (k) of this AD and email to: AMOC@faa.gov . Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the responsible Flight Standards Office. (2) Contacting the Manufacturer: For any requirement in this AD to obtain instructions from a manufacturer, the instructions must be accomplished using a method approved by the Manager, International Validation Branch, FAA; or Transport Canada; or MHI RJ Aviation ULC's Transport Canada Design Approval Organization (DAO). If approved by the DAO, the approval must include the DAO-authorized signature. (k) Additional Information For more information about this AD, contact Fatin Saumik, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: 516-228-7300; email: fatin.r.saumik@faa.gov. (l) Material Incorporated by Reference (1) The Director of the Federal Register approved the incorporation by reference (IBR) of the material listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51. (2) You must use this material as applicable to do the actions required by this AD, unless this AD specifies otherwise. (i) Transport Canada AD CF-2025-63, dated November 28, 2025. (ii) [Reserved] (3) For Transport Canada material identified in this AD, contact Transport Canada, Transport Canada National Aircraft Certification, 159 Cleopatra Drive, Nepean, Ontario K1A 0N5, Canada; telephone 888-663-3639; email TC.AirworthinessDirectives-Consignesdenavigabilite.TC@tc.gc.ca. You may find this material on the Transport Canada website at tc.canada.ca/en/aviation. (4) You may view this material at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 206-231-3195. (5) You may view this material at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations or email fr.inspection@nara.gov. Issued on January 12, 2026. Steven W. Thompson, Acting Deputy Director, Compliance & Airworthiness Division, Aircraft Certification Service.